{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:AYGTEMU3JOLMYHHAG7JGSQ6TWI","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"1b527062824a4231fe83545eeab354f261b370c911db2bd7c9135dee689c173d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-06T17:00:07Z","title_canon_sha256":"b0129b18689feac9188a316fc11e73638261def249720ce03fb4d920336adcdd"},"schema_version":"1.0","source":{"id":"2608.06269","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.06269","created_at":"2026-08-07T01:41:05Z"},{"alias_kind":"arxiv_version","alias_value":"2608.06269v1","created_at":"2026-08-07T01:41:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.06269","created_at":"2026-08-07T01:41:05Z"},{"alias_kind":"pith_short_12","alias_value":"AYGTEMU3JOLM","created_at":"2026-08-07T01:41:05Z"},{"alias_kind":"pith_short_16","alias_value":"AYGTEMU3JOLMYHHA","created_at":"2026-08-07T01:41:05Z"},{"alias_kind":"pith_short_8","alias_value":"AYGTEMU3","created_at":"2026-08-07T01:41:05Z"}],"graph_snapshots":[{"event_id":"sha256:40d99683f7d6ab7a48d592c09f054d6b4c66e88ab35990ea6a9c1be06867e5d8","target":"graph","created_at":"2026-08-07T01:41:05Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2608.06269/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The inspiral and merger of two supermassive black holes (SMBHs) releases immense energy in low-frequency gravitational waves (GWs). Recent pulsar timing array (PTA) observations of the stochastic nHz GW background (GWB) are consistent with a SMBH binary origin. GW data from PTAs and from the upcoming Laser Interferometer Space Antenna (LISA) can probe late-stage binary evolution where electromagnetic constraints are scarce. However, the complexity of the relevant astrophysics necessitates a well optimized approach. I argue that a key physical quantity to constrain with PTAs is the orbital semi","authors_text":"Laura Blecha","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-06T17:00:07Z","title":"An \"inside-out\" approach to modeling supermassive black hole binary inspiral"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.06269","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:184c1c9bc8db1579c5b6833773a412442b7893f7700534492de83d4d7b4ab751","target":"record","created_at":"2026-08-07T01:41:05Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"1b527062824a4231fe83545eeab354f261b370c911db2bd7c9135dee689c173d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-06T17:00:07Z","title_canon_sha256":"b0129b18689feac9188a316fc11e73638261def249720ce03fb4d920336adcdd"},"schema_version":"1.0","source":{"id":"2608.06269","kind":"arxiv","version":1}},"canonical_sha256":"060d32329b4b96cc1ce037d26943d3b20d93cebf616dc1cf50361607d08cc3ee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"060d32329b4b96cc1ce037d26943d3b20d93cebf616dc1cf50361607d08cc3ee","first_computed_at":"2026-08-07T01:41:05.735879Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-07T01:41:05.735879Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KZuwyEJtfA1/ttgkpvUgrLmj2tnYAxdvv4ziagZ3pavnH3zJBrbh0GXptVU4tGEpn/gC5EstKc7V8lo8WvkHCg==","signature_status":"signed_v1","signed_at":"2026-08-07T01:41:05.737449Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.06269","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:184c1c9bc8db1579c5b6833773a412442b7893f7700534492de83d4d7b4ab751","sha256:40d99683f7d6ab7a48d592c09f054d6b4c66e88ab35990ea6a9c1be06867e5d8"],"state_sha256":"aeb312010c2c2fb42d46142e4541298c807ab3e660003eb28e9708d17f878cbd"}